The space expert – known for presenting Stargazing Live and Wonders of the Universe – has suggested that all forms of intelligent life destroys itself before it is able to meet another species.

The rate of scientific advances are always outstripped by environmental or selfish factors of a population, he believes.

Earth 2 unveiled: Proxima b

Proxima b, which was unveiled today, is a new Earth-like planet orbiting Proxima Centauri – the closest neighbouring star to the Sun. It occupies in the "habitable zone" of the star, where temperatures are cool enough for the water, and therefore life, to thrive

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An alien world is thought to be lurking right on Earth's doorstep

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He told The Sunday Times: "It may be that the growth of science and engineering inevitably outstrips the development of political expertise, leading to disaster."

It puts a dampener on the hopes of millions who believe intelligent life is out there.

But there is still hope that aliens exist.

Several believe a bizarre star in our galaxy is proof that an intelligent species has advanced enough to harness whole stars' energy for fuel.

Tabby's star has baffled scientists for its bizarre flashing and dimming after sensation research came out last week.

Many suggested that an alien megastructure is surrounding it – sapping its light energy.

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ALIEN: Several believe Tabby's star is covered by a megastructure built by aliens

Notable People That Have Seen UFOs or Know of Their Existence

According to these celebrities, aliens and UFOs are among us.

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William Shatner: is a UFO believer, saying, 'There is no doubt that there is life out there; the mathematics of it lead you to that absolute conclusion. In my mind, there is no doubt that the universe teems - with life in all its form'

Top scientists said it is impossible to rule the theory out, but there are conflicting theories that the strange light patterns are due to a large asteroid shower sending shadows through the cosmos.